Not really. Blood spurts would be simple enough, just take away the files and nothing would apppear (Although it still depends on the game's programming). But gibs are in the game's engine. There is something in the engine that tells the game to "break off that guy's leg" if he is shot there. It would be a matter of replacing models, re-coding scripts and a big fuss over something inconsequential. I fail to see how killing can be okay for someone as long as it looks pretty.